Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 434

www.dell.com | support.dell.com Table 24-5. Pre-defined WRED Profiles Default Profile Name wred_drop wred_teng_y wred_teng_g wred_fortyg_y wred_fortyg_g Minimum Threshold 0 467 467 467 467 Maximum Threshold 0 4671 4671 4671 4671 Maximum Drop Rate 100 100 50 50 25 Create WRED Profiles To create a WRED profile, follow these steps: 1. To create a WRED profile, use the wred command from CONFIGURATION mode. 2. The wred command places you in WRED mode. From this mode, specify minimum and maximum threshold values using the threshold command. Apply a WRED Profile to Traffic After you create a WRED profile, you must specify to which traffic FTOS should apply the profile. FTOS assigns a color (also called drop precedence)-red, yellow, or green-to each packet based on the DSCP value before queuing it. DSCP is a 6-bit field. If the fourth bit from MSB in DSCP is 0, then it is assigned as green packet. If it is 1, then it is assigned as Yellow packet (expect DSCP of 111111, which is a Red packet and is always dropped). If you do not configure FTOS to honor DSCP values on ingress, all traffic defaults to green (refer to Honor DSCP Values on Ingress Packets). To assign a WRED profile to either yellow or green traffic, use the wred command from QOS-POLICY-OUT mode. Display Default and Configured WRED Profiles To display default and configured WRED profiles and their threshold values, use the show qos wred-profile command from EXEC mode (Figure 24-12). Figure 24-12. Displaying WRED Profiles FTOS#show qos wred-profile Wred-profile-name wred_drop wred_teng_y wred_teng_g min-threshold 0 467 467 max-threshold 0 4671 4671 max-drop-rate 100 100 50 432 | Quality of Service (QoS)